custom made 3/4mdf ported 2x12" box. 3.5ft^3
$100 for the box or
$250 for the box with 2 new RF P3 subs or
$400 for the box, the subs, and a JBL bp1200.1 sub amp

subs are 500rms/1000peak each dual 4ohm
amp is 1200rms@2ohm
subs are wired parallel parallel = 1.3 ohm total